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Article History

Received: 21 March 2021

Accepted: 1 June 2021

First Online: 19 June 2021

Declarations

:

: The study protocol was approved by the local ethics committee of the Danylo Halytsky Lviv National Medical University (reference number: 2; 25.02.2019). Informed consent was obtained in written form from parents or legal guardians of all patients involved in the study. All methods in the study were carried out in accordance with relevant guidelines and regulations.

: Not applicable.

: The authors declare that they have no competing interests.